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Use of aqueous alkali aluminosilicate for profile modification, water control and stabilization

a technology of aqueous alkali aluminosilicate and profile modification, applied in the direction of silicate, sealing/packing, borehole/well accessories, etc., can solve the problems of severe loss of strength, difficult control of set times, limitations of alkali silicate-based technology, etc., to achieve more controllable set, high mechanical strength, and high tolerance to contaminants

Active Publication Date: 2016-10-04
PQ LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0028]The present invention relates to an alkali silicate such as sodium silicate that has been reacted with aluminum. This aluminum modified sodium silicate can undergo the same setting reactions associated with alkali silicate. The aqueous alkali aluminosilicate (also called AAAS) shows a higher tolerance towards contaminants and has a more controllable set than standard sodium silicate. Upon setting, aqueous alkali aluminosilicate shows higher mechanical strength, greater water resistance and less syneresis than commercially grade sodium silicates. In addition the aqueous alkali aluminosilicate material can be made to crystallize to yield a hard, durable aluminosilicate crystal. Another positive benefit is the initial flexibility of the aluminosilicate set that allows for easier placement.
[0030]Further, this novel aluminosilicate can be made to crystallize in a subterranean environment and be used to modify profile, control water and provide stabilization.
[0040]h) higher final mechanical strength on setting and greater resistance to water

Problems solved by technology

Alkali silicate-based technology does have limitations.
Set times can be difficult to control due to exposure to contaminants such as salt, metals and organics.
Changes in reservoir conditions and temperature also impact set times. Depending on the contamination, there can also be severe loss of strength.
Gelled alkali silicates also have the further disadvantage of syneresis.
Although commonly used, these alkali silicate reactions may be negatively affected as follows:reaction rate for gelation is sensitive to the presence of salt (NaCl);gels may exhibit syneresis when formed in excess water; andfresh water zones require treatment with a multivalent cation to initiate precipitation.

Method used

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  • Use of aqueous alkali aluminosilicate for profile modification, water control and stabilization
  • Use of aqueous alkali aluminosilicate for profile modification, water control and stabilization
  • Use of aqueous alkali aluminosilicate for profile modification, water control and stabilization

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0054]An aqueous sodium aluminosilicate was prepared having the previously indicated composition. The aluminosilicate system solution was mixed with deionized water at the indicated weight to weight ratios. A Brookfield PVS rheometer was used to measure crystallization time. Viscosity readings were taken at predetermined time intervals at a shear rate of 5.11 s−1. Prior to crystallization the aqueous alkali aluminosilicate increased in viscosity. Viscosity changes were monitored as a function of time, temperature and chemical additives.

[0055]Aqueous alkali aluminosilicate can be made to crystallize by diluting with water. Table 2 a indicates the time for crystallization at 45° C. In contrast, aqueous sodium silicate is infinitely soluble in fresh water. Table 2B shows the long term properties of a 1:1 weight to weight mix of aqueous alkali aluminosilicate to water.

[0056]

TABLE 2ACrystallization Time vs. dilution with waterAqueous SodiumTime toTest #AluminosilicateWaterRatioCrystalliz...

example 2

[0058]Example 2 measured the effect of temperature on rate of crystallization at a constant ratio of aqueous sodium aluminosilicate to water. The results are shown in Table 3.

[0059]

TABLE 3Aqueous SodiumAluminosilicateWaterTime toTest #(g)(g)TemperatureCrystallization115 g15 g25° C.210minutes215 g15 g45° C.25minutes315 g15 g65° C.5minutes415 g15 g85° C.minute

[0060]By knowing the downhole temperature, the rate of crystallization can be modified by any number of techniques including adjusting the level of dilution of the aqueous aluminosilicate with water, increasing the alkalinity of the solution, and altering the relative composition of SiO2 to Na2O to Al2O3.

example 3

[0061]Example 3 shows the crystallization rate at a constant ratio of aqueous sodium aluminosilicate can be slowed by increasing alkalinity. A 50% solution of NaOH was added to water and then mixed into the aqueous sodium aluminosilicate. Reaction temperature was 45° C. The results are shown in Table 4.

[0062]

TABLE 4Aqueous SodiumAluminosilicateWaterNaOH (50%)Time toTest #(g)(g)(g)Crystallization115 g15 g—25 minutes215 g15 g0.75 g75 minutes

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Abstract

Embodiments of the invention relate to methods for making and compositions including aqueous alkali aluminosilicates used for conformance. The aqueous alkali aluminosilicates provide similar reaction characteristics of alkali silicates, and in addition provide enhanced conformance properties due to their ability to crystallize.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to U.S. Provisional Patent Application No. 61 / 703,467 filed in the United States Patent and Trademark Office on Sep. 20, 2012 and is incorporated herein by reference.FIELD OF THE INVENTION[0002]This invention relates to the blocking and strengthening of permeable zones in subterranean environments using aqueous alkali aluminosilicate. These applications include the control of water and gas flows for oil field, grouting for construction, and water shut-off for mining.BACKGROUND OF THE INVENTION[0003]The focus of the patent is on oilfield applications that include lost circulation, cement repair, sand consolidation and conformance applications. The term conformance describes the management and alteration of water and gas flows in a subterranean environment to optimize hydrocarbon production. The term “water shut-off” is often used interchangeably with conformance. Water shut-off represents a major subset of ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C01B33/26E21B33/138
CPCC01B33/26
Inventor MCDONALD, MICHAEL J.MILLER, NEILHAMILTON, JANICE
Owner PQ LLC
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